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Intangible Assets - Narrative (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) county country | Sep. 30, 2024 USD ($) county
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | $ 0 | $ 0 | $ 0 | $ 0
Broadband licenses granted, number of counties | county |  |  | 161 | 1
Exchanges - licenses received |  |  | $ 115,032,000 | $ 126,000
Licenses exchanged |  |  | 21,514,000 | 33,000
Gain on exchange of intangible assets, net | 59,600,000 | 0 | 93,518,000 | 93,000
Payments to acquire intangible assets |  |  | 17,147,000 | 10,904,000
Decrease in contingent liability |  |  | (7,425,000) | (10,000,000)
Gain on sale of intangible assets, net | 11,469,000 | $ 0 | 12,430,000 | 0
Licensing Agreements |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Exchanges - licenses received |  |  | 115,000,000.0 | 100,000
Licenses exchanged |  |  | $ 21,500,000 | 0
Licensing Agreements | Lower Colorado River Authority |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Broadband licenses granted, number of counties | county |  |  | 50 |
Broadband licenses transferred, total consideration |  |  | $ 28,500,000 |
Payments to acquire intangible assets |  |  | 13,600,000 |
Decrease in contingent liability |  |  | 14,900,000 |
Reduction of intangible assets | 14,900,000 |  | 16,100,000 |
Gain on sale of intangible assets, net | $ 11,500,000 |  | $ 12,400,000 |
Licensing Agreements | Oncor Electric Delivery Company LLC |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Broadband licenses granted, number of counties | country |  |  | 3 |
Broadband licenses transferred, total consideration |  |  | $ 300,000 | 0
Reduction of intangible assets |  |  | 300,000 | 0
Gain on sale of intangible assets, net |  |  | $ 8,000 | $ 0

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- Definition Gain From Disposal Of Intangible Assets + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 + Details
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